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Summary
| Description |
English: Text associated with the figure in the original publication (excerpt): The study of a large number of mesosaur specimens from Uruguay and Brazil has provided interesting information about the changes that take places during the ontogeny of the group. One of the most amazing discovering was an almost complete, very small and beautiful preserved specimen, which was interpreted as a non-hatched Mesosaurus (Piñeiro et al. 2012)[1], probably close to complete its development, although some indications of its foetal stage are clear: the porous and poorly ossified nature of the bones, the structure of the teeth, including uncomplete and bifurcated elements, the incipient development of the front limbs, particularly the hands, contrasting with the high size of the feet, which preserve what appears to be an astragalus, as the only tarsal element observed. This specimen consists therefore, the only evidence of reproduction in an early amniote and allows us to reconstruct the earliest stages of one of the most complete ontogenetic transition known for a basal component of the group. Note: According to Piñeiro et al. (2012)[1] this specimen (catalogue no. FC-DPV 2504) is an external mold, and according to Laurin & Pineiro (2017)[2] it comes from the Lower Permian Mangrullo Formation of Uruguay. Deutsch: Abdruckfossil (Exemplar-Nr.: FC-DPV 2504) eines sehr kleinen Individuums von Mesosaurus, das als noch nicht aus dem Ei geschlüpftes Jungtier interpretiert wird (Piñeiro et al. 2012)[1]. Neben der eingerollten Postur sprechen folgende Merkmale für ein Entwicklungsstadium in der (späten) Fötalphase: die Porosität und schwache Verknöcherung des Skeletts, der Bau der Zähne (einschließlich unvollständiger und gegabelter Elemente) sowie ein relativ früher Entwicklungszustand der Vordergliedmaßen (speziell der Hände/Vorderfüße) im Gegensatz zum fortgeschrittenen Entwicklungszustrand der Hinterfüße mit dem Astragalus als anscheinend einzigem verknöcherten Element der Fußwurzel. Es handelt sich um die geologisch ältesten Funde von ungeborenen/ungeschlüpften Individuen eines Amnioten-Taxons. Laurin & Pineiro (2017)[2] zufolge stammt das Stück aus der unterpermischen Mangrullo-Formation von Uruguay.
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| Date | (publication date) |
| Source | Fig. S1 in: The ontogenetic transformation of the mesosaurid tarsus: a contribution to the origin of the primitive amniotic astragalus. PeerJ 4:e2036, doi:10.7717/peerj.2036 |
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| Permission (Reusing this file) |
This image (or more exactly: its slightly different original version) was published in PeerJ journal. Their website states that the content of all PeerJ articles is published under the Creative Commons Attribution 4.0 license, unless indicated otherwise. |
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This is a retouched picture, which means that it has been digitally altered from its original version. Modifications: The image was rotated counter-clockwise by 90°, the position of the scale bar was changed, and a red arrow at the bottom of the specimen that was indicating the tarsus was retouched. Anatomical/osteologcial information of the actual fossil was in no way affected by image editing!. Modifications made by Gretarsson.
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File history
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 12:02, 22 January 2019 | | 1,547 × 1,869 (3.09 MB) | Gretarsson | {{Information |description ={{en|1=Text associated with the figure in the original publication (excerpt): ''The study of a large number of mesosaur specimens from Uruguay and Brazil has provided interesting information about the changes that take places during the ontogeny of the group. One of the most amazing discovering was an almost complete, very small and beautiful preserved specimen, which was interpreted as a non-hatched ''Mesosaurus'' (Piñeiro et al. 2012), probably close to complet... |
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